TaskPaper manages your to-do list using a plain text file, which is the best way to store your to-dos, but it feels like an app, not just a text editor. It doesn't force you into any one specific to-do list style, but understands the format you want as you type and makes it easy to gather all your tasks together. That way, you can stop futzing with your task list and actually start working on your tasks. Hit the link below to check out the sale, and be sure to get it before its price goes back up tomorrow.